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Comment by Shadowriver

The Stalagg don't need to be owned by you, regardless who owns him and who kill him, the death Feugen will summon 11/11 Thaddius (https://twitter.com/bdbrode/status/491287127561613314). Which means if both players own both cards in deck, one of players have chance to summon Thaddius twice, which means playing with just single card of pair in deck, as well as playing one of them first then opponent might be situational disadvantage.

Also if card that result summon will be golden, summoned Thaddius will also be golden

Comment by TGFseb15

No need to be sad little Feugen, you're a 4/7 for 5, everyone will like you more than Stalagg, trust me. ;)

Comment by NeuromanteGoblin

Here are some facts so far:

1) If both Stalagg and Feugen die in the same game, Thaddius is summoned. There is no Thaddius "card" that you can draw, pick in a draft, or craft.2) Thaddius stats are the sum of both Stalagg and Feugen stats: his casting cost (if returned to the hand) is 10 crystals, while Stalagg and Feugen are 5 crystals each, and the attack and defense is the sum of both cards attack and defense.3) It doesn't matter on which side the last half of the summoners dies: if player A had Stalagg and was killed, and player B has Feugen and dies later, then player B gets Thaddius. This may happen if player A lost control of the second half, if it was stolen by Mindgames, whatever.4) If somehow say Stalagg dies first, then Feugen dies, then another Feugen dies via for instance Mindgames or Faceless Manipulator copy, then another Thaddius is summoned. The instances of both summoners dying doesn't erase the conditions to summon Thaddius. 5) If both dudes die at the same time (think Twisting Nether for example) here's what happens: first, both summoners die, then both deathrattles go to the stack and trigger, then you get two copies of Thaddius each one on the side each summoner died. You can add in a Baron Rivendare for more insane shenanigans.

Comment by Xinhuan

Obtaining the Card

This card is obtained by unlocking the Construct Quarter of Naxxramas and defeating Thaddius. He is the fourth and final boss of the wing. Specifically, this card is a reward from the achievement.

Unlocking the Military Quarter first requires you to unlock the Arachnid, Plague and Military Quarters (you don't need to beat them), as the wings of Naxxramas must be unlocked in order. (Source: Ben Brode)

Both Stalagg and Feugen are rewarded when you defeat the Construct Quarter even though the rewards popup only lists Feugen. (Source: Aratil)

The golden version of this card can only be obtained by crafting, and only after obtaining the non-golden version of the card.

The non-golden version cannot be disenchanted. The golden version can be disenchanted.

Game Mechanics

If multiple minions die at the same time, any Deathrattles resolve in the order the dying minions were summoned. (Source: Ben Brode)

If the board is full (7 minions) due to other Deathrattle effects triggering first, the potential Thaddius will not be summoned.

The ownership of Feugen and Stalagg are irrelevant. The triggering condition is that the other just need to have died. The owner of the second one to die will get Thaddius. (Source: Ben Brode)

To prevent Thaddius from being summoned, only the second one to die (of the pair) needs to be silenced. Silencing the first one doesn't achieve anything. (Source: Ben Brode #1, #2)

If Feugen and Stalagg both die simultaneously for any reason (eg, Twisting Nether, or one attacking into the other) then both Deathrattles will summon Thaddius for their respective owners. This is because minions are marked dead simultaneously before any Deathrattles are resolved, even though the Deathrattles themselves resolve in order of age. (Source: #1, #2, #3, #4). Blizzard has also clarified on the forums this is working as intended.

Baron Rivendare will double the simultaneous death Deathrattles (listed right above) to 4 Thaddius, as expected.

If Stalagg or Feugen is returned to hand (from the Battlefield) and fails to do so because the player's hand is full (10 cards), then it will instead die and trigger its Deathrattle. Blizzard has clarified that this is working as intended.

If the second one to die is golden, it will summon a golden Thaddius. (Source: Ben Brode)

If Feign Death is played, and Feugen has not died yet, the Deathrattle will do nothing. (Source: Ben Brode)

Bugs

If Stalagg or Feugen is returned to hand (from the Battlefield) and fails to do so because the player's hand is full (10 cards), then it will instead die and trigger its Deathrattle. Blizzard has clarified that this is working as intended. But, such a death by bouncing to hand is not recorded by the game, so when the second one dies later (by any means) and its Deathrattle is checked, Thaddius is not summoned. See http://www.youtube.com/watch?v=56tLx26t1Iw (first 30 seconds). This is verified to be a bug.

Additional Notes

Feugen is a very strong minion by itself in the 5-mana slot. Along with a meaty 7 health, it has 4 Attack which puts it in the dead zone of Priests too. Many decks may potentially run Feugen without running Stalagg.

The Shaman Challenge features both Stalagg and Feugen. Reincarnate can be used on the second construct to spawn an additional Thaddius.

Trivia

Feugen has Four attack. Stalagg has Seven attack. The first letter of a word is on the left, just like the attack value on the card.

In WoW, Feugen and Stalagg are a pair of bosses that reside on 2 separate platforms. They have to be killed simultaneously within 5 seconds of each other, otherwise the surviving boss will resurrect the other one. Both must be killed on their own respective platforms; if they leave their platforms, they will Chain Lightning the entire raid via a Tesla Coil they need to stay near to. The pair of bosses will kick their respective tanks across the entire room to the other platform every 30 seconds, exchanging their threat levels as well. Once both are dead, Thaddius will spawn on a third platform.

Comment by skorpek

Comment by Demonrider363

A nice combo to utilize Feugen is to use him first, and play Stalagg later in the game. This is because a 4/7 is tougher to deal with early on. After Feugen is dead (even if it was silenced), you can kill off your other minion and therefore summon Thaddius, as a Warlock, with Stalagg + ... :

Comment by Beetis

Just lost a game to someone who played this combo. Fun fact: Silencing Feugen or Stalagg then killing both will still summon Thaddius. Had the game in the bag until that happened.

Comment by Octotron2000

If Sneed's Old Shredder summons either Stalagg or Feugen in a game where Thaddius has already been summoned, will they summon another Thaddius on death or will another set of Stalagg and Feugen need to be killed?

Comment by elionor

i might be a bit late but today i learned something new about these guys not only can this effect be triggered more then once per turn but after this effect is triggered the first time only feugen OR stalagg need to die to summon thadius again meaning its actually gets easier to summon thadius after the first time making it even more daunting then it already was